Concrete rocf-tile pallet



F. C. HYTEN AND P. J. HAWKINS.

CONCRETE ROOF TILE PALLET. 'APPUCATION FILED DEC.28. 192I- m mw;

Paten ted Aug; 8 1922.

FOEREST G. T-IYTEIT AND PAUL J. I-EZA'WKINS, OF INDIliNAY3OLIS, INDIANA,

CONCRETE ROCTF-TILE PALLET.

Specification of lletters Patent.

ll atented Aug. 8, 1922,.

Application filed December 28, 1921. Serial No. 525,422.

To ii Z 10 40171 ii may cancer 11,.

'Ele it known that we, l onnnsr U. llY'rnN and Partial. ilAlYlilNS, citizens of the United bt ates, rcsi ling at lndiauauolis, in the county of lttari on and tltate of Indiana, have invented new and useful improvements in Concrete llool 'lile Pallets, of which the following is a specification.

Concrete rooting tiles, to be of practical value, must be so light in weight as not to overburden its supports or require too heavy rafters in the root construction. It is frequently as thin as three-eighths of an inch in thickness, and is best produced by troweling the top surface. This requires a concrete mixture which is rich in cement, and which contains enough water to make it trowel easily and smoothly. A rich and wet aggregate thus required has a tendency to slump clown and lose its shape readily where the tile is being formed upon a smooth plate or pallet, particularly as the surface of the latter in contact with the cement must be oiled or greased to keep the product from sticking to the mold when the time comes to remove said product. The concrete material during said manufacture tends to mass in front of the trowel-bar and to thin out and loose its density in the middle portions of the tile, due to the under-surface slipping ot the concrete material as it is tamped and troweled.

The object of this invention is to provide means to reduce the tendency of the wet concrete to slip along the surface oi? the pallet during the nuinu'liacture ot a tile and a further object is to provide means for nailing through the tile without breaking it.

ll e accomplish the above, and other objects which will hereinafter appear, by the means illustra ted in the accompanying drawing, in which- Fig. l. is a perspective view of trowel guides and other pallet supports, with a pallet indicated by dotted lines, the view showing the trowel-bar in the operation oi troweling a root tile. Fig. 2, is a top plan view of a pallet embodying our improvements. Fig. is an end view of the pallet shown in i 4-, is a section onthe line 4c'4c 2, and Fig. 5 is a section on the line ig. Like chara ters of rei'erence indicate like e everal views of the drawing. Referring to Fig. 1,, 6, is a trowel-bar which is manually reciprocated on a pair of parallel e uic e-bars T, 7, between which and a patrol transverse bars 8, 8, is a pallet 9, the end o'l' which is shown by dotted lines in this view. The pallet 9 supports the con and gives shape to the underside oi the finished tile. As is indicated in Fig. l, a surplus of concrete material 10 is pushed ahead ofthe trowel-bar in forming a tile 11, and the tenacity of the concrete tends to cause the trowcled material to slip on a smooth p llet surface and lose its density in its effort to follow the mass pushed by the trowel-bar. I

Our invention is to overcome the above tendency by providing an obstruction or resistance on the concrete-contacting surface of the pallet. This may be in the form of depressions in the surface of the pallet, but, in practice, we have found a reverse formation, that is, a series of projecting lugs 12 on the principal area and smaller lugs 13 on the marginal ribs 14 to be preferable to depressions because ol the greater ease in removing the finished product from the pallet after it has sul'liciently dried, and also because the projections on the mold result in depressions on the tile, which interfere less with the assembly of the tiles in a root.

lVc also provide semi-spherical projections 15, 15, where nail holes are desired, for astcning the tiles to the root-sheeting, and hese projections 15 also act as anti-slipping formations to hold the wet concrete during the molding of the tile.

ll e have -found that the projections from the pallet surface as shown and above described effectually prevent the slipping and crawling ot the wet concrete material. under the troweling action, and that the density of the linished product is substantially uniform throughout the entire length of the tile and is not weaker and more liable to break at its middle portions, as was the case where a smooth surfaced pallet was used.

ll hile we have here shown the pallet molding surface as provided with lugs or ribs with their greatest lengths in the direction of the greatest length of the pallet, it is ob vious that satisfactory results may be obtained by a ditlerent arrangement of the projecting surfaces such as diagonally or in curves, or by providing depressions instead of projections in the manner above stated and We therefore do not desire to be unduly limited in carrying out our invention in practice, or any more than is required by the appended claims, and

Having thus fully described our invention what we claim as new and Wish to secure by Letters Patent is- I 1. A pallet on which concrete roofing tiles are troweled in the manufacture of the tiles, having projections in addition to those for positioning the mold members and giving form to the tile at frequent intervals over the entire concrete contacting surface of the pallet to check the sliding of the wet concrete on the pallet during the troweling operation.

2. A pallet on which concrete roofing tiles are troweled in the manufacture of the tiles, having a plurality of projections near one end to check the sliding of the wet concrete are troweled in the manufacture of the tiles during the troweling operation and to form nailing indents in the tile.

3. A pallet on which concrete roofing tiles 7 having a plurality of projections near one end to form nailing indents in the tile, and having a plurality of lower projections in addition to those for positioning the mold members and giving form to the tile at frequent intervals over the other portions of the concrete contacting-surface of the pallet, all of said projections servingto check the sliding movement of the wet concrete on the pallet during the troweling operation.

Signed at Indianapolis, Indiana, this the 23 day of December 1921.

FORREST C. HYTEN. PAUL J. HAWKINS. 

